X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=net%2Fnetfilter%2Fnf_conntrack_expect.c;h=2191fe008f60d9800f753df273f0d510a3419dd0;hb=56b3d975bbce65f655c5612b4822da671f9fd9b2;hp=c31af29a4439f9266592abe0c162cf97fef291b7;hpb=d6454706c382ab74e2ecad7803c434cc6bd30343;p=linux-2.6-omap-h63xx.git

diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index c31af29a443..2191fe008f6 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -19,6 +19,7 @@
 #include <linux/err.h>
 #include <linux/percpu.h>
 #include <linux/kernel.h>
+#include <linux/jhash.h>
 
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_core.h>
@@ -26,11 +27,20 @@
 #include <net/netfilter/nf_conntrack_helper.h>
 #include <net/netfilter/nf_conntrack_tuple.h>
 
-LIST_HEAD(nf_conntrack_expect_list);
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_list);
+struct hlist_head *nf_ct_expect_hash __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_expect_hash);
 
-struct kmem_cache *nf_conntrack_expect_cachep __read_mostly;
-static unsigned int nf_conntrack_expect_next_id;
+unsigned int nf_ct_expect_hsize __read_mostly;
+EXPORT_SYMBOL_GPL(nf_ct_expect_hsize);
+
+static unsigned int nf_ct_expect_hash_rnd __read_mostly;
+static unsigned int nf_ct_expect_count;
+unsigned int nf_ct_expect_max __read_mostly;
+static int nf_ct_expect_hash_rnd_initted __read_mostly;
+static int nf_ct_expect_vmalloc;
+
+static struct kmem_cache *nf_ct_expect_cachep __read_mostly;
+static unsigned int nf_ct_expect_next_id;
 
 /* nf_conntrack_expect helper functions */
 void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
@@ -40,60 +50,83 @@ void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
 	NF_CT_ASSERT(master_help);
 	NF_CT_ASSERT(!timer_pending(&exp->timeout));
 
-	list_del(&exp->list);
-	NF_CT_STAT_INC(expect_delete);
+	hlist_del(&exp->hnode);
+	nf_ct_expect_count--;
+
+	hlist_del(&exp->lnode);
 	master_help->expecting--;
-	nf_conntrack_expect_put(exp);
+	nf_ct_expect_put(exp);
+
+	NF_CT_STAT_INC(expect_delete);
 }
 EXPORT_SYMBOL_GPL(nf_ct_unlink_expect);
 
-static void expectation_timed_out(unsigned long ul_expect)
+static void nf_ct_expectation_timed_out(unsigned long ul_expect)
 {
 	struct nf_conntrack_expect *exp = (void *)ul_expect;
 
 	write_lock_bh(&nf_conntrack_lock);
 	nf_ct_unlink_expect(exp);
 	write_unlock_bh(&nf_conntrack_lock);
-	nf_conntrack_expect_put(exp);
+	nf_ct_expect_put(exp);
+}
+
+static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple)
+{
+	if (unlikely(!nf_ct_expect_hash_rnd_initted)) {
+		get_random_bytes(&nf_ct_expect_hash_rnd, 4);
+		nf_ct_expect_hash_rnd_initted = 1;
+	}
+
+	return jhash2(tuple->dst.u3.all, ARRAY_SIZE(tuple->dst.u3.all),
+		      (((tuple->dst.protonum ^ tuple->src.l3num) << 16) |
+		       tuple->dst.u.all) ^ nf_ct_expect_hash_rnd) %
+	       nf_ct_expect_hsize;
 }
 
 struct nf_conntrack_expect *
-__nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple)
+__nf_ct_expect_find(const struct nf_conntrack_tuple *tuple)
 {
 	struct nf_conntrack_expect *i;
+	struct hlist_node *n;
+	unsigned int h;
+
+	if (!nf_ct_expect_count)
+		return NULL;
 
-	list_for_each_entry(i, &nf_conntrack_expect_list, list) {
+	h = nf_ct_expect_dst_hash(tuple);
+	hlist_for_each_entry(i, n, &nf_ct_expect_hash[h], hnode) {
 		if (nf_ct_tuple_mask_cmp(tuple, &i->tuple, &i->mask))
 			return i;
 	}
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(__nf_conntrack_expect_find);
+EXPORT_SYMBOL_GPL(__nf_ct_expect_find);
 
 /* Just find a expectation corresponding to a tuple. */
 struct nf_conntrack_expect *
-nf_conntrack_expect_find_get(const struct nf_conntrack_tuple *tuple)
+nf_ct_expect_find_get(const struct nf_conntrack_tuple *tuple)
 {
 	struct nf_conntrack_expect *i;
 
 	read_lock_bh(&nf_conntrack_lock);
-	i = __nf_conntrack_expect_find(tuple);
+	i = __nf_ct_expect_find(tuple);
 	if (i)
 		atomic_inc(&i->use);
 	read_unlock_bh(&nf_conntrack_lock);
 
 	return i;
 }
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_find_get);
+EXPORT_SYMBOL_GPL(nf_ct_expect_find_get);
 
 /* If an expectation for this connection is found, it gets delete from
  * global list then returned. */
 struct nf_conntrack_expect *
-find_expectation(const struct nf_conntrack_tuple *tuple)
+nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple)
 {
 	struct nf_conntrack_expect *exp;
 
-	exp = __nf_conntrack_expect_find(tuple);
+	exp = __nf_ct_expect_find(tuple);
 	if (!exp)
 		return NULL;
 
@@ -119,17 +152,18 @@ find_expectation(const struct nf_conntrack_tuple *tuple)
 /* delete all expectations for this conntrack */
 void nf_ct_remove_expectations(struct nf_conn *ct)
 {
-	struct nf_conntrack_expect *i, *tmp;
 	struct nf_conn_help *help = nfct_help(ct);
+	struct nf_conntrack_expect *exp;
+	struct hlist_node *n, *next;
 
 	/* Optimization: most connection never expect any others. */
 	if (!help || help->expecting == 0)
 		return;
 
-	list_for_each_entry_safe(i, tmp, &nf_conntrack_expect_list, list) {
-		if (i->master == ct && del_timer(&i->timeout)) {
-			nf_ct_unlink_expect(i);
-			nf_conntrack_expect_put(i);
+	hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) {
+		if (del_timer(&exp->timeout)) {
+			nf_ct_unlink_expect(exp);
+			nf_ct_expect_put(exp);
 		}
 	}
 }
@@ -141,25 +175,16 @@ static inline int expect_clash(const struct nf_conntrack_expect *a,
 {
 	/* Part covered by intersection of masks must be unequal,
 	   otherwise they clash */
-	struct nf_conntrack_tuple intersect_mask;
+	struct nf_conntrack_tuple_mask intersect_mask;
 	int count;
 
-	intersect_mask.src.l3num = a->mask.src.l3num & b->mask.src.l3num;
 	intersect_mask.src.u.all = a->mask.src.u.all & b->mask.src.u.all;
-	intersect_mask.dst.u.all = a->mask.dst.u.all & b->mask.dst.u.all;
-	intersect_mask.dst.protonum = a->mask.dst.protonum
-					& b->mask.dst.protonum;
 
 	for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 		intersect_mask.src.u3.all[count] =
 			a->mask.src.u3.all[count] & b->mask.src.u3.all[count];
 	}
 
-	for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
-		intersect_mask.dst.u3.all[count] =
-			a->mask.dst.u3.all[count] & b->mask.dst.u3.all[count];
-	}
-
 	return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask);
 }
 
@@ -168,36 +193,29 @@ static inline int expect_matches(const struct nf_conntrack_expect *a,
 {
 	return a->master == b->master
 		&& nf_ct_tuple_equal(&a->tuple, &b->tuple)
-		&& nf_ct_tuple_equal(&a->mask, &b->mask);
+		&& nf_ct_tuple_mask_equal(&a->mask, &b->mask);
 }
 
 /* Generally a bad idea to call this: could have matched already. */
-void nf_conntrack_unexpect_related(struct nf_conntrack_expect *exp)
+void nf_ct_unexpect_related(struct nf_conntrack_expect *exp)
 {
-	struct nf_conntrack_expect *i;
-
 	write_lock_bh(&nf_conntrack_lock);
-	/* choose the the oldest expectation to evict */
-	list_for_each_entry_reverse(i, &nf_conntrack_expect_list, list) {
-		if (expect_matches(i, exp) && del_timer(&i->timeout)) {
-			nf_ct_unlink_expect(i);
-			write_unlock_bh(&nf_conntrack_lock);
-			nf_conntrack_expect_put(i);
-			return;
-		}
+	if (del_timer(&exp->timeout)) {
+		nf_ct_unlink_expect(exp);
+		nf_ct_expect_put(exp);
 	}
 	write_unlock_bh(&nf_conntrack_lock);
 }
-EXPORT_SYMBOL_GPL(nf_conntrack_unexpect_related);
+EXPORT_SYMBOL_GPL(nf_ct_unexpect_related);
 
 /* We don't increase the master conntrack refcount for non-fulfilled
  * conntracks. During the conntrack destruction, the expectations are
  * always killed before the conntrack itself */
-struct nf_conntrack_expect *nf_conntrack_expect_alloc(struct nf_conn *me)
+struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me)
 {
 	struct nf_conntrack_expect *new;
 
-	new = kmem_cache_alloc(nf_conntrack_expect_cachep, GFP_ATOMIC);
+	new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC);
 	if (!new)
 		return NULL;
 
@@ -205,12 +223,12 @@ struct nf_conntrack_expect *nf_conntrack_expect_alloc(struct nf_conn *me)
 	atomic_set(&new->use, 1);
 	return new;
 }
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_alloc);
+EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);
 
-void nf_conntrack_expect_init(struct nf_conntrack_expect *exp, int family,
-			      union nf_conntrack_address *saddr,
-			      union nf_conntrack_address *daddr,
-			      u_int8_t proto, __be16 *src, __be16 *dst)
+void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
+		       union nf_conntrack_address *saddr,
+		       union nf_conntrack_address *daddr,
+		       u_int8_t proto, __be16 *src, __be16 *dst)
 {
 	int len;
 
@@ -224,8 +242,6 @@ void nf_conntrack_expect_init(struct nf_conntrack_expect *exp, int family,
 	exp->helper = NULL;
 	exp->tuple.src.l3num = family;
 	exp->tuple.dst.protonum = proto;
-	exp->mask.src.l3num = 0xFFFF;
-	exp->mask.dst.protonum = 0xFF;
 
 	if (saddr) {
 		memcpy(&exp->tuple.src.u3, saddr, len);
@@ -242,21 +258,6 @@ void nf_conntrack_expect_init(struct nf_conntrack_expect *exp, int family,
 		memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3));
 	}
 
-	if (daddr) {
-		memcpy(&exp->tuple.dst.u3, daddr, len);
-		if (sizeof(exp->tuple.dst.u3) > len)
-			/* address needs to be cleared for nf_ct_tuple_equal */
-			memset((void *)&exp->tuple.dst.u3 + len, 0x00,
-			       sizeof(exp->tuple.dst.u3) - len);
-		memset(&exp->mask.dst.u3, 0xFF, len);
-		if (sizeof(exp->mask.dst.u3) > len)
-			memset((void *)&exp->mask.dst.u3 + len, 0x00,
-			       sizeof(exp->mask.dst.u3) - len);
-	} else {
-		memset(&exp->tuple.dst.u3, 0x00, sizeof(exp->tuple.dst.u3));
-		memset(&exp->mask.dst.u3, 0x00, sizeof(exp->mask.dst.u3));
-	}
-
 	if (src) {
 		exp->tuple.src.u.all = (__force u16)*src;
 		exp->mask.src.u.all = 0xFFFF;
@@ -265,36 +266,42 @@ void nf_conntrack_expect_init(struct nf_conntrack_expect *exp, int family,
 		exp->mask.src.u.all = 0;
 	}
 
-	if (dst) {
-		exp->tuple.dst.u.all = (__force u16)*dst;
-		exp->mask.dst.u.all = 0xFFFF;
-	} else {
-		exp->tuple.dst.u.all = 0;
-		exp->mask.dst.u.all = 0;
-	}
+	memcpy(&exp->tuple.dst.u3, daddr, len);
+	if (sizeof(exp->tuple.dst.u3) > len)
+		/* address needs to be cleared for nf_ct_tuple_equal */
+		memset((void *)&exp->tuple.dst.u3 + len, 0x00,
+		       sizeof(exp->tuple.dst.u3) - len);
+
+	exp->tuple.dst.u.all = (__force u16)*dst;
 }
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_init);
+EXPORT_SYMBOL_GPL(nf_ct_expect_init);
 
-void nf_conntrack_expect_put(struct nf_conntrack_expect *exp)
+void nf_ct_expect_put(struct nf_conntrack_expect *exp)
 {
 	if (atomic_dec_and_test(&exp->use))
-		kmem_cache_free(nf_conntrack_expect_cachep, exp);
+		kmem_cache_free(nf_ct_expect_cachep, exp);
 }
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_put);
+EXPORT_SYMBOL_GPL(nf_ct_expect_put);
 
-static void nf_conntrack_expect_insert(struct nf_conntrack_expect *exp)
+static void nf_ct_expect_insert(struct nf_conntrack_expect *exp)
 {
 	struct nf_conn_help *master_help = nfct_help(exp->master);
+	unsigned int h = nf_ct_expect_dst_hash(&exp->tuple);
 
 	atomic_inc(&exp->use);
+
+	hlist_add_head(&exp->lnode, &master_help->expectations);
 	master_help->expecting++;
-	list_add(&exp->list, &nf_conntrack_expect_list);
 
-	setup_timer(&exp->timeout, expectation_timed_out, (unsigned long)exp);
+	hlist_add_head(&exp->hnode, &nf_ct_expect_hash[h]);
+	nf_ct_expect_count++;
+
+	setup_timer(&exp->timeout, nf_ct_expectation_timed_out,
+		    (unsigned long)exp);
 	exp->timeout.expires = jiffies + master_help->helper->timeout * HZ;
 	add_timer(&exp->timeout);
 
-	exp->id = ++nf_conntrack_expect_next_id;
+	exp->id = ++nf_ct_expect_next_id;
 	atomic_inc(&exp->use);
 	NF_CT_STAT_INC(expect_create);
 }
@@ -302,16 +309,16 @@ static void nf_conntrack_expect_insert(struct nf_conntrack_expect *exp)
 /* Race with expectations being used means we could have none to find; OK. */
 static void evict_oldest_expect(struct nf_conn *master)
 {
-	struct nf_conntrack_expect *i;
+	struct nf_conn_help *master_help = nfct_help(master);
+	struct nf_conntrack_expect *exp = NULL;
+	struct hlist_node *n;
 
-	list_for_each_entry_reverse(i, &nf_conntrack_expect_list, list) {
-		if (i->master == master) {
-			if (del_timer(&i->timeout)) {
-				nf_ct_unlink_expect(i);
-				nf_conntrack_expect_put(i);
-			}
-			break;
-		}
+	hlist_for_each_entry(exp, n, &master_help->expectations, lnode)
+		; /* nothing */
+
+	if (exp && del_timer(&exp->timeout)) {
+		nf_ct_unlink_expect(exp);
+		nf_ct_expect_put(exp);
 	}
 }
 
@@ -327,17 +334,24 @@ static inline int refresh_timer(struct nf_conntrack_expect *i)
 	return 1;
 }
 
-int nf_conntrack_expect_related(struct nf_conntrack_expect *expect)
+int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 {
 	struct nf_conntrack_expect *i;
 	struct nf_conn *master = expect->master;
 	struct nf_conn_help *master_help = nfct_help(master);
+	struct hlist_node *n;
+	unsigned int h;
 	int ret;
 
 	NF_CT_ASSERT(master_help);
 
 	write_lock_bh(&nf_conntrack_lock);
-	list_for_each_entry(i, &nf_conntrack_expect_list, list) {
+	if (!master_help->helper) {
+		ret = -ESHUTDOWN;
+		goto out;
+	}
+	h = nf_ct_expect_dst_hash(&expect->tuple);
+	hlist_for_each_entry(i, n, &nf_ct_expect_hash[h], hnode) {
 		if (expect_matches(i, expect)) {
 			/* Refresh timer: if it's dying, ignore.. */
 			if (refresh_timer(i)) {
@@ -354,57 +368,86 @@ int nf_conntrack_expect_related(struct nf_conntrack_expect *expect)
 	    master_help->expecting >= master_help->helper->max_expected)
 		evict_oldest_expect(master);
 
-	nf_conntrack_expect_insert(expect);
-	nf_conntrack_expect_event(IPEXP_NEW, expect);
+	if (nf_ct_expect_count >= nf_ct_expect_max) {
+		if (net_ratelimit())
+			printk(KERN_WARNING
+			       "nf_conntrack: expectation table full");
+		ret = -EMFILE;
+		goto out;
+	}
+
+	nf_ct_expect_insert(expect);
+	nf_ct_expect_event(IPEXP_NEW, expect);
 	ret = 0;
 out:
 	write_unlock_bh(&nf_conntrack_lock);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(nf_conntrack_expect_related);
+EXPORT_SYMBOL_GPL(nf_ct_expect_related);
 
 #ifdef CONFIG_PROC_FS
-static void *exp_seq_start(struct seq_file *s, loff_t *pos)
+struct ct_expect_iter_state {
+	unsigned int bucket;
+};
+
+static struct hlist_node *ct_expect_get_first(struct seq_file *seq)
 {
-	struct list_head *e = &nf_conntrack_expect_list;
-	loff_t i;
+	struct ct_expect_iter_state *st = seq->private;
 
-	/* strange seq_file api calls stop even if we fail,
-	 * thus we need to grab lock since stop unlocks */
-	read_lock_bh(&nf_conntrack_lock);
+	for (st->bucket = 0; st->bucket < nf_ct_expect_hsize; st->bucket++) {
+		if (!hlist_empty(&nf_ct_expect_hash[st->bucket]))
+			return nf_ct_expect_hash[st->bucket].first;
+	}
+	return NULL;
+}
 
-	if (list_empty(e))
-		return NULL;
+static struct hlist_node *ct_expect_get_next(struct seq_file *seq,
+					     struct hlist_node *head)
+{
+	struct ct_expect_iter_state *st = seq->private;
 
-	for (i = 0; i <= *pos; i++) {
-		e = e->next;
-		if (e == &nf_conntrack_expect_list)
+	head = head->next;
+	while (head == NULL) {
+		if (++st->bucket >= nf_ct_expect_hsize)
 			return NULL;
+		head = nf_ct_expect_hash[st->bucket].first;
 	}
-	return e;
+	return head;
 }
 
-static void *exp_seq_next(struct seq_file *s, void *v, loff_t *pos)
+static struct hlist_node *ct_expect_get_idx(struct seq_file *seq, loff_t pos)
 {
-	struct list_head *e = v;
+	struct hlist_node *head = ct_expect_get_first(seq);
 
-	++*pos;
-	e = e->next;
+	if (head)
+		while (pos && (head = ct_expect_get_next(seq, head)))
+			pos--;
+	return pos ? NULL : head;
+}
 
-	if (e == &nf_conntrack_expect_list)
-		return NULL;
+static void *exp_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	read_lock_bh(&nf_conntrack_lock);
+	return ct_expect_get_idx(seq, *pos);
+}
 
-	return e;
+static void *exp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	(*pos)++;
+	return ct_expect_get_next(seq, v);
 }
 
-static void exp_seq_stop(struct seq_file *s, void *v)
+static void exp_seq_stop(struct seq_file *seq, void *v)
 {
 	read_unlock_bh(&nf_conntrack_lock);
 }
 
 static int exp_seq_show(struct seq_file *s, void *v)
 {
-	struct nf_conntrack_expect *expect = v;
+	struct nf_conntrack_expect *expect;
+	struct hlist_node *n = v;
+
+	expect = hlist_entry(n, struct nf_conntrack_expect, hnode);
 
 	if (expect->timeout.function)
 		seq_printf(s, "%ld ", timer_pending(&expect->timeout)
@@ -421,7 +464,7 @@ static int exp_seq_show(struct seq_file *s, void *v)
 	return seq_putc(s, '\n');
 }
 
-static struct seq_operations exp_seq_ops = {
+static const struct seq_operations exp_seq_ops = {
 	.start = exp_seq_start,
 	.next = exp_seq_next,
 	.stop = exp_seq_stop,
@@ -430,14 +473,96 @@ static struct seq_operations exp_seq_ops = {
 
 static int exp_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &exp_seq_ops);
+	struct seq_file *seq;
+	struct ct_expect_iter_state *st;
+	int ret;
+
+	st = kmalloc(sizeof(struct ct_expect_iter_state), GFP_KERNEL);
+	if (st == NULL)
+		return -ENOMEM;
+	ret = seq_open(file, &exp_seq_ops);
+	if (ret)
+		goto out_free;
+	seq          = file->private_data;
+	seq->private = st;
+	memset(st, 0, sizeof(struct ct_expect_iter_state));
+	return ret;
+out_free:
+	kfree(st);
+	return ret;
 }
 
-const struct file_operations exp_file_ops = {
+static const struct file_operations exp_file_ops = {
 	.owner   = THIS_MODULE,
 	.open    = exp_open,
 	.read    = seq_read,
 	.llseek  = seq_lseek,
-	.release = seq_release
+	.release = seq_release_private,
 };
 #endif /* CONFIG_PROC_FS */
+
+static int __init exp_proc_init(void)
+{
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *proc;
+
+	proc = proc_net_fops_create("nf_conntrack_expect", 0440, &exp_file_ops);
+	if (!proc)
+		return -ENOMEM;
+#endif /* CONFIG_PROC_FS */
+	return 0;
+}
+
+static void exp_proc_remove(void)
+{
+#ifdef CONFIG_PROC_FS
+	proc_net_remove("nf_conntrack_expect");
+#endif /* CONFIG_PROC_FS */
+}
+
+module_param_named(expect_hashsize, nf_ct_expect_hsize, uint, 0600);
+
+int __init nf_conntrack_expect_init(void)
+{
+	int err = -ENOMEM;
+
+	if (!nf_ct_expect_hsize) {
+		nf_ct_expect_hsize = nf_conntrack_htable_size / 256;
+		if (!nf_ct_expect_hsize)
+			nf_ct_expect_hsize = 1;
+	}
+	nf_ct_expect_max = nf_ct_expect_hsize * 4;
+
+	nf_ct_expect_hash = nf_ct_alloc_hashtable(&nf_ct_expect_hsize,
+						  &nf_ct_expect_vmalloc);
+	if (nf_ct_expect_hash == NULL)
+		goto err1;
+
+	nf_ct_expect_cachep = kmem_cache_create("nf_conntrack_expect",
+					sizeof(struct nf_conntrack_expect),
+					0, 0, NULL, NULL);
+	if (!nf_ct_expect_cachep)
+		goto err2;
+
+	err = exp_proc_init();
+	if (err < 0)
+		goto err3;
+
+	return 0;
+
+err3:
+	nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_vmalloc,
+			     nf_ct_expect_hsize);
+err2:
+	kmem_cache_destroy(nf_ct_expect_cachep);
+err1:
+	return err;
+}
+
+void nf_conntrack_expect_fini(void)
+{
+	exp_proc_remove();
+	kmem_cache_destroy(nf_ct_expect_cachep);
+	nf_ct_free_hashtable(nf_ct_expect_hash, nf_ct_expect_vmalloc,
+			     nf_ct_expect_hsize);
+}